Biological Nitrogen Fixation Systems of the Tropical 

 - New York   John Wiley and Sons  1977 
<br/><br/><label>ISBN: </label>0 471 99499 5 
<br/><br/><label>LC Class. No.: </label>589.704133/BIO 
<br/><br/><label>Dewey Class. No.: </label>589.704133/BIO